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3rd Edition books are not compatible with 2nd Edition

The Focus On Student Textbooks (3rd Edition) cover a single-subject area for any one of the 5 core disciplines (chemistry, biology, physics, geology, and astronomy).

-There are 12 chapters in each textbook (Focus on Biology has 16 chapters).
-Chapters are kept short to help students master content efficiently.
-Ideal as an introductory textbook.
-Subjects and grade levels are purchased separately.

3rd Edition materials are not compatible with 2nd Edition materials.